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If you look closely, you can see that she has wings.
But this also annoys me. The hero model has horns that are not present on the portrait. The succubus units have hooves instead of feet, but here they added heels, what the heck. I'm not even mentioning that the whip serves as a tail. In Heroes 5, I liked the succubi, and in Oblivion and Skyrim, the fire atronachs could also play a similar role, but here it's just a woman with wings, so what, it's not a big deal.